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Adhesive sheet

a technology of adhesive sheets and adhesive sheets, applied in the field of adhesive sheets, can solve the problems of increasing costs, complex production processes, and insufficient sliding of pressure sensitive adhesive surfaces, and achieve the effect of simple application method and high sliding ability

Pending Publication Date: 2021-09-02
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The adhesive sheet described in this patent has a unique surface structure that allows it to slide easily under low pressure and provide a strong adhesive force when pressure is applied. This surface structure includes a fine network of cones or frustum structures made up of non-adhesive or weak adhesive material at the top and strong adhesive material at the bottom. The adhesive sheet can be produced using a simple method of applying a material to a liner with the fine structure.

Problems solved by technology

In such known adhesive sheets, slidability of the pressure sensitive adhesive surface is still not sufficient, and further improvements are required of them.
In addition, since a particulate material such as glass microspheres is often used, this tends to increase the cost and make the production process complex.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

production example 1

(1) Production of Mold Having Fine Structure

[0075]A mold having a plurality of uniformly arranged square pyramid or square frustum structures was made by processing a flat plate of a resin or metal. Laser processing was used for the resin, and processing with a diamond cutter was used for the metal. The size of the square pyramid or square frustum structures in each mold is shown in Table 1. The size was measured by observing the surface of the mold using a high precision microscope, and the observed one square pyramid or square frustum structure having the most clear image was selected for measurement.

(2) Production of Liner Having Fine Structure

[0076]A base liner was provided which includes layers composed of polyethylene (PE) on both surfaces of a sheet made of polyethylene terephthalate (PET) or paper, and one of the PE layers is coated with silicone to have a release surface. A mold was applied to the release surface of the base liner, and the fine structure of the mold was tr...

reference example 2

uding Protrusions at Intervals of 300 μm, Made of Cellulose Containing Ceramic Beads)

production example 2

[0080]A liner (lower liner) was provided in the same manner as in Production Examples 1 (1) to (3), in which a solid polyurethane resin was disposed at the bottoms of square pyramid or square frustum structures of a fine structure. A UV curable acrylic foam adhesive precursor composed mainly of 2-ethylhexyl acrylate was applied to the fine structure surface of the liner, and then another liner (upper liner) was overlaid so that a gap of approximately 2 mm was created between the liner and the lower liner. UV irradiation was performed over the liner to cure the adhesive. The thickness of the adhesive layer thus formed was 2 mm.

[0081]The samples thus obtained were evaluated for slidability of the upper and lower surfaces. The results are shown in Table 3.

TABLE 3Production Example 2Lower linerUpper linerMoldMainMoldMainSlidabilityIDMaterialIDMaterialLowerUpperExampleAPaper(SmoothPET102-1liner)ExampleAPET(SmoothPET102-2liner)ExampleBPaper(SmoothPET202-3liner)ExampleBPET(SmoothPET202-4li...

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Abstract

A pressure sensitive adhesive surface that does not adhere to the adherend and can be positioned by sliding it under low pressure, while it can exert a sufficient adhesive force under a pressure above a certain level. The adhesive sheet includes an adhesive layer with a fine structure on a surface thereof. The fine structure includes a plurality of cone or frustum structures, with the cones or frustums having two or more parts joined to each other via an interface. A first part is present on a top of the cones or frustums and is formed from a non-adhesive or a weak adhesive material, and a second part is present below the first part and is formed from a strong adhesive material.

Description

TECHNICAL FIELD[0001]The present disclosure relates to a layer of adhesive backing a film in sheet, tape or strip form (hereinafter collectively referred to as an “adhesive sheet”), in particular to an adhesive sheet that has high slidability under low pressure, but can exhibit an adhesive force under a pressure above a certain level, and a method for producing the adhesive sheet.BACKGROUND ART[0002]Adhesive sheets such as decorative sheets (e.g., paint replacement film) backed with a pressure sensitive adhesive surface are difficult to apply to an adherend at a desired position, because adhesiveness is exhibited by just slight contact of the pressure sensitive adhesive surface with the adherend. In order to solve the problem, it has been attempted to provide a pressure sensitive adhesive surface that does not initially adhere to an adherend so it can be positioned by sliding it under low pressure (i.e., has slidability), while it can exert a sufficient adhesive force, when it is un...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09J7/10C09J7/38
CPCC09J7/10C09J7/38C09J2301/208C09J2301/206C09J2301/10C09J2301/40
Inventor MIKAMI, HARUYUKI
Owner 3M INNOVATIVE PROPERTIES CO
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